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IS200MVRAH2A

IS200MVRAH2A - Servo Board

IS200MVRAH2A - Servo Board IS200MVRAH2A - Servo Board

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SPECIFICATIONS

Part Number: IS200MVRAH2A
Manufacturer: General Electric
Series: Mark VIe
Product type: I/O Interface Board
Country of Manufacture: United States (USA)

Functional Description

IS200MVRAH2A is an I/O Interface Board developed by GE. It is a part of Mark VIe series. It is designed to provide analog and digital signal interfacing between field instrumentation and the PMVe processor over a high-speed serial link (HSSL). The MVRA module supports a range of I/O signal types commonly used in industrial turbine control and power generation systems. This board functions as a modern replacement for earlier-generation Mark V TCQA (Trip Control and Quiescent Alarm) and IOMA (Input/Output Module A) boards. By integrating both analog and digital interfaces into a single module and connecting to the controller via HSSL, the MVRA offers enhanced signal processing capabilities, improved data throughput, and streamlined wiring.

Functional Role within Mark VIe System

The MVRA operates under the control of the PMVe (Power Management and Vibration Executive) module, which runs specialized embedded software to handle the acquisition, control, and communication of the connected I/O. The configuration of the MVRA is managed through the Mark VIe ToolboxST application, where engineers can define scaling, alarm thresholds, sensor types, and other operational parameters.

Supported Input and Output Types

Supports a broad range of signal types critical to turbine and generator monitoring and control:

  • Thermocouple Inputs (Simplex Only): Used for temperature measurement of turbine components. The board supports cold-junction compensation and linearization in firmware.
  • LVDT and Servo Valve Interfaces: For position feedback and actuation control. The MVRA provides the necessary excitation and signal conditioning.
  • Pulse Rate Inputs: Suitable for speed pickups or flow sensors that output frequency-based signals. These are counted and filtered for rotational speed or flow calculation.
  • Proximeter Inputs: Used to monitor shaft vibration or position. The board accepts raw proximeter signals and processes them within the controller.
  • Analog Inputs (AI): Standard current or voltage inputs (e.g., 4–20 mA, 0–5 V, 0–10 V), used for various process measurements such as pressure, temperature, or level.
  • Analog Outputs (AO): For driving actuators or interfacing with other control systems. Outputs are typically 4–20 mA or 0–10 V and are configurable through ToolboxST.
  • PTR Relays: Used for protective tripping and other logic outputs. The MVRA includes relay drivers with feedback monitoring.
  • Bus Voltage and Generator Voltage Monitoring: Analog inputs dedicated to capturing voltage levels for synchronization, protection, or display.
  • CPD (Compressor Discharge Pressure) and Megawatt Measurement: Specific inputs are dedicated to monitoring compressor pressure and electrical power output, typically scaled for high-resolution measurement.

Integration and Configuration

The MVRA module is fully integrated into the Mark VIe system architecture. It communicates with the controller via the high-speed serial link (HSSL), reducing analog wiring length and enhancing noise immunity. Configuration and diagnostics are managed via the GE ControlST software environment, which provides tools for mapping, simulation, live monitoring, and fault detection.

Redundancy options are available through system-level architecture, though the MVRA itself is often deployed in simplex configurations depending on the application’s criticality.

 

 

Installation Procedure

  • I/O interface board is installed in rack position 1, directly behind the PMVe (Power Management and Vibration Executive) module. Proper installation ensures signal integrity and secure communication between the MVRA and the PMVe through the High-Speed Serial Link (HSSL).
  • To prevent damage to the module or the system, all installation steps should be carried out under electrostatic discharge (ESD)-safe conditions and by GE Mark VIe system installation procedures. Step-by-Step Installation Instructions:
  • Power Down the System: Ensure that all power to the core is completely disconnected before beginning the installation. This is critical for operator safety and to prevent accidental damage to the board or connected equipment.
  • Disconnect Existing Cables: Gently remove all ribbon cables and power connectors from the MVRA. Observe cable orientation: the red or blue stripe on ribbon cables indicates pin 1 and should always align to the left side of the connector as per system convention.
  • Release Board Retention Tabs: With one hand supporting the board, depress the three top and three bottom locking tabs simultaneously to disengage the module from its card guides and backplane connectors.
  • Remove the Existing MVRA: Carefully slide the old board out of the rack without bending any connectors or components. Immediately place the board into a static-protective (ESD) bag to prevent damage from electrostatic discharge.
  • Install the New MVRA Board: Remove the replacement MVRA from its static-protective bag. Align the card with the card guides and gently slide it into the backplane until it is firmly seated. Snap the top and bottom locking tabs back into place to secure the board.
  • Reconnect the HSSL Link Cable: Connect the High-Speed Serial Link (HSSL) cable between the MVRA and the PMVe. Verify the integrity and seating of all connections before restoring power.
  • Power Up and Test: Once the system is reassembled and powered up, verify communication between the MVRA and the controller using the ToolboxST diagnostic tools. Ensure that the board is recognized, and all configured I/O channels are functioning correctly.

Synchronization Check (Sync Check) Functionality

  • The MVRA includes embedded sync check logic, mirroring the functionality previously found in the Mark V TCQA board. This feature is critical for generator synchronization, ensuring that connection to the electrical grid occurs only under acceptable phase, frequency, and voltage conditions.
  • The sync check operation is implemented in the onboard Field-Programmable Gate Array (FPGA), which provides deterministic logic execution. The FPGA receives limit parameters from the control application via the PMVe and enforces these parameters to determine synchronization permissive conditions.
  • The sync check logic controls a relay enable permissive signal, which allows generator breaker closure only when phase angle, voltage, and frequency differentials are within configured thresholds.
  • Instead of relying solely on instantaneous phase comparison, the MVRA employs a time-based algorithm for improved precision and performance.
  • The number of tooth pulses (typically from a synchro-check or generator speed pickup sensor). The number of 25 MHz clock ticks between those pulses. This dual-counting method improves the accuracy of speed and acceleration measurements, enabling quicker and safer synchronization, especially during load fluctuations or ramp-up conditions.
  • Engineers can configure sync check settings via the ToolboxST, including Maximum allowable phase angle difference,  Frequency mismatch limits,  Voltage tolerance bands. These parameters are stored in the controller and periodically updated to the FPGA via the PMVe.

Recalibration Requirements

Recalibration procedures are essential to ensure accurate control of servo-operated actuators and consistent system behavior, especially when hardware components are replaced or modified. In systems where liquid fuel regulators operate without LVDTs (Linear Variable Differential Transformers), recalibration is typically not required. These configurations rely on open-loop control without feedback from positional sensors, and therefore do not depend on calibration data stored or associated with feedback hardware.

For servo-controlled components such as the PSVO (Primary Servo Valve Output), PSVP (Primary Servo Valve Power), and PCAA (Position Control Analog Actuator) modules, recalibration is mandatory whenever a new terminal board is installed. This requirement is due to the dependency of the system on precise signal conditioning characteristics that can vary between different terminal boards.

Barcode Verification Mechanism:

  • Each terminal board includes a unique barcode ID, which is read by the system during the reconfiguration load process.
  • The controller maintains a record of the barcode associated with the most recent valid calibration.
  • If the barcode of the currently installed terminal board does not match the stored value, the system interprets this as a hardware change and flags the need for recalibration.

Recalibration Procedure and Data Handling:

  • Upon successful recalibration, the controller updates its configuration to associate the new terminal board’s barcode with the stored calibration data.
  • This ensures consistency in servo response and maintains system integrity across power cycles or system reloads.
  • This mechanism helps prevent mismatches between calibration data and hardware, which could lead to improper actuator behavior or degraded performance.

Diagnostics and Board Identification

Equipped with built-in diagnostic features that support both hardware validation and system integrity checks during power-up and runtime.

  • Onboard Identification Device: The MVRA includes a non-volatile, read-only identification (ID) device, implemented as a chip on the board. This device stores critical board metadata, including Serial number (unique to each board instance), Board type identifier, Hardware revision level.
  • Interrogation by PMVE: During system startup or reinitialization, the PMVE (controller module) queries this ID chip to verify the installed hardware. The controller uses this information to ensure The correct board is installed in the designated rack position. The firmware and system configuration match the hardware type and revision.
  • Role in Power-Up Diagnostics: The ID check is an integral part of the Mark VIe system power-up diagnostics. If a mismatch is detected (e.g., wrong board type or version), the system can log a diagnostic fault and, depending on severity, prevent controller startup or raise alarms for operator review. This identification and verification process enhances system reliability, reduces configuration errors, and supports predictive maintenance by logging board-level changes over time.

WOC is happy to assist you with any of your automation requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.

FREQUENTLY ASKED QUESTIONS

What is IS200MVRAH2A?
It is an I/O Interface Board developed by GE.

Do liquid fuel regulators require recalibration?
Only if LVDTs are used. If the regulator operates without LVDT feedback, recalibration is not required. Open-loop control systems that don’t rely on position feedback are exempt from calibration routines.

How does the controller determine if a terminal board has changed?
Each terminal board includes a barcode ID, which the controller reads during configuration load. If the stored barcode ID does not match the currently connected board, the system identifies this as a hardware change and flags recalibration.

What is the purpose of the ID chip on the MVRA board?
The ID chip stores Board type, Serial number, and Hardware revision. This data is used by the PMVE controller during power-up diagnostics to validate board integrity and compatibility.